Puller hoist



Aug. 25, 1936. T. H. EDELBLUTE FULLER HOI S T .Filed Dec. 13, 1954 3Sheets-Sheet l INVENTOR. J//4 M//V.6W

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ATTORNEY?v Aug.- 25, 1936. T. H. EDELBLUTE I 2,051,832

FULLER HOIST Filed Dec. 13, 1954 3 Sheets-Sheet 3 56 7 WITNESSES Z sINVENTOR. MM M M $244 ATTORNEY-5- Patented Aug. 25, 1936 PATENT" OFFIQEPULLER HOI ST Thomas H. Edelblute, Reynoldsville, Pa. ApplicationDecember 13, 1934, Serial No. 757,296

4 Claims.

This invention'relates to power jacks and hoists, and'while notnecessarily so limited has to do more particularly with lever operatedforce multiplying devices of this character in which a pawl and ratchetarrangement is employed to transmit the movement of the power elementtothe workelement, and vice versa.

One of the objects of the invention is to provide an improvedpower-transmitting, holding. and:

releasing pawl and ratchet arrangement for use in devices of thischaracter which is simple and sturdy of construction and dependable inoperation irrespectiveof the vice is operated.

Another object is to provide in a power-multiplying unit of this typefor easily and quickly reversing the operation of the work-element andfor doing so in such a Way that the-operating.

lever is relieved of the load pressure strokes.

A further object is to provide a-simple', compact and sturdilyconstructed power device of the aforementioned character which may beoperated as either a hoist or a jack and as efbetween fectively in oneposition as in another.

A still further object is to provide a powerunit of this type in whichthe driving and holding pawls function automatically at. all times-These and various other objects, as well as, the

as; various other novel features and advantages of the invention will beapparent when the'follow' ing detailed description is read inconjunction with the accompanying drawings, of whichFig. 1. is anelevational view of a power unit constructed In accordance with theinvention .showingz'it sus- Fig.8 but showing the pawl-controllingmecha,

pended from an overhead support and utilized as a hoist; Fig. 2 asimilar view illustrating the'unit in a horizontal position being usedas a-puller jack; Fig. 3 a plan view looking into the top of the .unit;Fig. 4 an exploded view of the pawl-controlling mechanism and a:fragmentary sectional View of the housing and pawls; Fig. 5 a vertical.

section taken on the line VV of Fig. 3 but showing the pawls andoperating connections therefor ;in elevation; Fig. 6 a side view lookingat the, reversing latch construction for the pawl-controlling mechanism;Fig. '7 a view looking into the side of the unit with portions of theside frame removed and showing the pawl-controlling mechanism adjustedfor normal power-applying operation, and the power lever disposed in itsrearmost position; Fig. 8 a fragmentary view similar to Fig. '7 showingthe power lever'actuated to its foremost position; Fig. 9 a viewsimilar'to position in which the denism adjusted for reversing theoperation of the unit; Fig. 10 a vertical section taken through aratchet type. power jack constructed in accordance with the inventionand showing the pawlcontrolling mechanism adjusted for lifting; and Fig.11 a fragmentary view similar to Fig. 10 but illustrating thepawl-controlling mechanism adjusted for lowering the lifting element.

Referring in detail to these drawings and first more particularly tothexembodimentofthe invention illustrated in Figs. 1 to 9 inclusive, thenumerals l and 2 designate a pair of side frames which form a housingfor the device. As shown, these frames are provided with flange-likeprojections la. and 2a along their bottom and rear edges which extend tomid-section of the housing and form a bottom and rear enclosing walltherefor as well as function to hold the side frames in spaced relationfrom one another. To holdthese frames together irrespective of anythingelse' a lug 3 is provided on the upper midsection of the flanges 2a toproject over the adjacent: flange l a. of the abutting side frame and apair of overlapping flange portions 4 and 5 is providedon the formed bythe flanges la and 2a., respectively. A screw or bolt 6' is passedthrough the flange la and secured to the lug 3 while the inner end ofananch'or hook I is secured by a nut 1a in a hole Bextending through thesections' land 5, the u provided a chainsprocket 9 and a ratchet wheel Hwhich are secured rigidly together and in the present embodiment areformed by a single casting which is mounted loosely on a shaft l2 theends of which are projected through suitable holes in the side frames land 2 and securely held in place by nutsl3; To prevent any bindingbetween the-ratchet and sprocket wheels and the side frames when thenuts are tightened the ends of the shaft l2 are reduced to provideshoulders thereon which bear against and main tain the proper spacing ofthe side frames.

Around the sprocket wheel 9-there is-mounted a chain M which is providedat one end with a hook or other suitable means l5 for connecting -it toa load. As shown, this is an ordinary link type of chain but may takeany other form which the sprocket wheel may beadapted to receive, and toprevent this chain jumping oiT the sprocket wheel a bafile wall or guideI!) is cast integral with the side frame 2. opposite the periphery ofupper end of the back wall z the sprocket wheel, while to preventfouling of the chain a hook-like guide 20 is also cast integral with theside frame 2 and projected so as to extend in the link groove at thecenter line of the sprocket wheel between the two points of contact ofthe chain on the outer side of said wheel.

For operating the ratchet Wheel 9 and likewise the sprocket wheel H apower lever I6 is employed. While this lever may take other forms itcomprises, as shown, three parts consisting of a tubular casting orsocket H which has a pair of spaced crank-forming ears l8 on its lowerend, a handle-forming tube |9 mounted in the upper end of the socket H,and a plug ring 2| mounted in the upper end of the handle l9 which is soshaped as to receive an operating cable 13 and also prevent an extensionbeing applied to the lever. At its lower end the casting ll is looselymounted to the rear of the sprocket and ratchet wheels on a supportingshaft 2| in the upper central part of the housing, and held in alignmentwith the ratchet wheel 9 by a collar 23 moun ed between the casting andthe side of the housing adjacent the sprocket wheel. Like the sprocketwheel shaft |2 this shaft is reduced at its ends to maintain the properspacing of the side frames and is held in place by suitable nuts 24.

Between the crank ears |8 on the lever socket ll a relatively smallcurved power-transmitting pawl 25 is mounted. The upper end of this pawlis pivotally secured to a pin 26 retained in the outer end of the earsl8, and it is so sized and formed as to adapt it to engage the teeth 21of the ratchet wheel and rotate the latter when the lever ii is movedfrom itsrearward to its forward position.

Below the driving pawl 25 there is provided a holding pawl 28 which issomewhat longer than the driving pawl and disposed to function to holdthe load on the ratchet wheel when the latter is not being moved by thedriving pawl. As shown, this holding pawl has a shape quite similar tothe driving pawl but is pivotally mounted at its supported end on afixed shaft 29 which is extended through the side frames I and 2 andequipped with a collar 3i to maintain the holding pawl in properalignment with the ratchet wheel Like the shafts I2 and 2| this lattershaft is also provided with reduced ends and equipped with nuts 32 forholding it in place.

For automatically controlling the operation of both the driving andholding pawls 25 and 28, respectively, a guiding and tripping mechanismis provided. As illustrated this comprises a spring rod 33 on which ablock 34 is keyed slightly below its mid-section on which there isprovided a stub shaft or trunnion 35 that is pivotally mounted in oneend of a supporting link 36 being held therein by a cotter pin 31. Atthe opposite end of this link 33 there is provided an axially disposedslot 38, in which a stub shaft 39 formed on an eccentric or crank member43 is projected, the link being held on this stub shaft by a cotter pin4|. On the opposite end and side of the eccentric 43 there is'provided apin 44 which is projected through an opening in the side frame 2 andabout which the eccentric is permitted to rotate for adjusting theposition of the slide rod 33 and the operation of the pawls 25 and 28 aswill presently appear.

On the upper end of the spring rod 33 there is loosely fitted a slideblock 45 which is held against removal from the rod by a cotter pin 46and provided at one side with a stub shaft or pin 41 which is mountedfor free rotary movement in an opening 48 provided in the driving pawl25 slightly below its center, being held therein by a cotter pin 49.Between the block 45 secured to the driving pawl 25 and the block 34keyed to the mid-section of the spring rod 33 there is arranged a coilspring Below the keyed block 34 on. the spring rod 33 there is looselymounted a second slide block 52 which is provided like the block 45 witha stub shaft 53. This latter stub shaft is extended through an opening54 in the mid-section of the holding pawl 28 and held therein by acotter pin 55. Between this second slide block 52 and a washer 56 heldby a cotter pin 5"! on the lower end of the spring rod 33 there isarranged a second coil spring 58 which is preferably similar to andinterchangeable with the upper coil spring 5|.

In accordance with the invention, these parts are so arranged andproportioned that when the eccentric is retained in the position shownin Figs. 7 and 8 the stub shaft 39 on the eccentric will engage theouter end of the slot 38 in the link 35 and hold the block 34 keyed tothe spring rod 33 in such a position as to cause the lower coil spring58 mounted on the spring rod to constantly bias the holding pawl againstthe periphery of the ratchet wheel and also cause the upper coil spring5| and the rod 33 to so guide the driving pawl 25 when the lever I5 isactuated in the forward direction as to cause the driving pawl to engagethe ratchet wheel two teeth above the holding pawl and in a full strokeof the lever to rotate the ratchet wheel a distance equal to slightlymore than one tooth length. Hence as the holding pawl 28 is constantlyheld against the periphery of the ratchet wheel under these conditionsit will slide over one tooth as the ratchet wheel is rotated by thedriving pawl and seat itself in the root of the next succeeding tooththereby holding the load on the back stroke of the lever.

When the eccentric 43 is actuated to the ver tical position shown inFig. 9, that is, with the stub shaft 39 disposed in its lowermostposition, the keyed block 34 and the spring rod 33 are lowered slightlyand the stub shaft 39 on the eccentric 43 moves inwardly in the slot 38of the link 36. The link 36 is now loose to slide, and through the block34 does not cause any tension .on the spring 5|. The entire reversemechanism is not forced to any movements by reason of connections to theeccentric 43. Under these conditions, when the power lever I6 is at theopposite position to that shown in Fig. 9, spring 58 is compressed undersome tension, and the load is on the holding pawl 28. This frees thedriving pawl 25 from the load, and as the lever I6 is moved forward, thespring 58, acting against the washer 55 pulls the spring rod 33 down andby the pin 45 lifts the driving pawl 25 over the edge of the ratchettooth and causes the drivin pawl to engage the tooth of the ratchetwheel next above the tooth engaged by the holding pawl, and as a resultonly moves the ratchet wheel sufficiently when actuated to its foremostposition to permit the holding pawl to disengage the ratchet wheel.During the forward movement of the lever the slide block 45 movesdownwardly on the spring rod placing the spring 5| under compression,and as soon as the holding pawl 28 is in a position to be released thepressure on the spring 5| causes the connecting link 36 together withthe spring rod and the holding pawl 28 to be projected back-wardly and.downwardlywith the-holdingpawl moving-into the' position shown: infulllines in Fig. 9, out of engagementlwith the ratchet wheel. With therelease' of the-holding 8 pawl28-the lever lfi i's backed'awaycarryingthe' load with it until the holding pawl is again pulledinto-engagement with: the ratchet 'wheelbythe spring rod and its springassembly whichoccurs after the rotatable wheelhas been per 10 mitted torotate a distance equal to one-tooth length. This operation can, ofcourse, be repeatediwithout: any further adjustment of the device,-andwithout regard to the pa-vvls astheyfunction automatically. 11F Topermit the-chain sprocket to berotated freely ineither direction whennot loaded the pawl controllin'g mechanism isso designed that the two"pawls can be supported out of contact;

withthe-teeth of the ratchet wheel atthe -same ZO-"time. This isaccomplished byadjustingthe'eccentric 43 to the reversing position: andafter re leasing the holding pawl' 28 moving. therlever 6 into midwayposition; I Foncontrolling the adjustment: of the eccentric Mt itssupporting shaft 44 isprovided wither non circular outerrend Ma.Onthisthere is mounted fonaxial displacement a latch 59 which=isprovided with: a: pair of diametrically opposed pro-,.J'ections=6-ttoform a handle and a pair of axially" *extendingdiametrically opposed lugs 62; To co operate with these lugs-62=angularly spaced-"Jugs 63 and 64 shown best in Figs. 3, 4, 5 and 6, areprovidedon the exterior of. the side frame 2 around the opening throughwhich the shaft 44 of the eccentric is projected. The spacing of theselugs is made such that when the projections 62 are engaged between twoopposed sets of them the eccentric 43 will be held in one operativeposition and when engaged between the other two it will be held in theother operative position. As shown, the lugs 63 are made shorter inlength than the lugs 64. This is done to permit the latch 59 to berotated only over the shorter ones, whereby limiting the extent ofmovement of the control latch.

To permit the latch to be lifted out of one set of the openings betweenthe difierent lugs and rotated into engagement with another set, it isresiliently held in place by a spring 65 which is mounted on the end ofthe shaft 44 projecting beyond the latch 59 by a washer 66 and set screw61. In adjusting the latch 59 it is lifted axially away from the sideframe 2 against the resistance of the spring 65 and then rotated to theposition selected, the spring being provided with a strength to hold thelatch in place once it is in position.

To adapt the device for use as an overhead hoist and provide foroperating the control latch 59 from the floor when the power unit is outof reach of the operator, a shifting element 68 is provided. Thiselement consists of a disc-like member provided with diametricallyopposed ears 69 in which the ends of a cable 10 long enough to reach theoperator are connected. The inner face of such element is provided witha pair of opposed inclined cams 'H which are adapted to normally seatbetween a pair of similar cooperating angular cams 12 provided on theside frame 2 adjacent the lugs 63 and 64. As shown best in Figs. 3, 4, 5and 6, the cams 12 on the side frame are so disposed that when theshifting element 68 is rotated by the cable 10 they engage the cams Hand cause the latch 59 to be lifted outwardly against the resistance ofthe spring 65. To rotate the latch from one position to another;diametrically opposed offsets areiproshiftingofithe latch 59;

For operating: the power lever- I6 from; the: floor:a..- cable-113. 3.attached to. the Plug It provided in the: free :end. of theoperatinglever: I6',.and toireturn the operatingilever to-:its rearmostposition: after; each lifting; movement a: coil; springt'li is connectedbetweenaboss IT on the.- outer endg-ofthe casting l1andabossi-lfion the;

rear endi of. the: housing of the device. Come--- quently',;a.fterzeachdownward movement the lever l 61 is automatically returned to itsretrieved" or:-

backward: position. In" accordance with this invention as illustratedinFig: .1,..the powerunit: may be connected to' ani-overheadrsupport suchas the-beam 19 :bythe. hook I and;the*chain* Mconnectedto the load bythevhookl5; Tozli'ftthe load 80 the'latch 594sadjusted' by the? cablev16 toathe position. showrrin Figs. 7 and 8 and thelever I6 operatedby-the cable 13: Kit is desiredyto lowerrthe load the latch' 59:isshiftedi: to its-reversing positionby;- thecable: 10 and lever l6operated in. the

same manner as: for lifting.

To use-.the device as: apuller jack as illustrated.

- irrli'ig. 2, thet-unittis'placedin a horizontal position" andconnected: to the-anchor and load Tinv tha-sammfashinniaszshowntinii'igzl;v Eorsoperaetion in: this manner: the shifting. element 68 may beremoved if; desired: and .the latch 59' manipulated by hand without theaid of a cable. Also, the spring 16 may be taken off if desired as itwill be unnecessary to have the'power handle l6 returned to itsretrieved position automatically.

Referring to Figs. 10 and 11, the invention is illustrated in connectionwith a lifting jack. As illustrated, however, it differs from thepreviously described embodiment essentially only in its shape and in thesubstitution of a ratchet bar 8| for the chain sprocket 9 and ratchetwheel II. For this reason it is deemed unnecessary to show the latchmechanism or to repeat the description of this embodiment in detail, itbeing believed suflicient to merely call attention to the fact that thecorresponding parts have been designated in the drawings by the samenumerals previously used but distinguished therefrom by the use of thesuflix z.

The operation of this latter embodiment of the invention is identicalwith the operation of the previously described embodiment andaccordingly the operation thereof is also not repeated.

According to the provisions of the patent statutes, I have explained theprinciple and mode of operation of my invention, and have illustratedand described what I now consider to be its best embodiment. However, Idesire to have it understood that, within the scope of the appendedclaims the invention may be practiced otherwise than as specificallyillustrated and described.

I claim:

1. An adjusting mechanism for a pivotally supported element, comprising,a wall in which said element is mounted, a series of offsets formed insaid walls about said element, a latch member mounted on said elementfor rotation therewith but relative thereto in an axial direction,yieldable means normally tending to bias said latch member intoengagement with said offsets, and means on said latch to facilitate itsadjustment from one operative position to another.

--2. An adjusting mechanism according to claim 1 1 but including inaddition theretoa shifting cam disposed between saidlatch and said wall,

said cambeing provided with apluralityof came 1 surfaces on itswall-engagingface, and said wall provided with a cooperating pluralityof cam developments which assists said shifting cam in releasing saidlatch element and carry it to a new position when said cam element isrotated.

3. A force multiplying unit comprising a supporting frame, a workelement mounted therein and equipped with a series of ratchet teeth, a

lever fulcrumed in said frame, a driving pawl mounted on said lever toengage the teeth of said 2 Work element and move it when the leverisactuated, a holding 'pawl mounted in said frame to.

engage said teeth and prevent backward movement of said work element, ablock pivotally mounted on one side of each of: said pawls andprovided'with an opening therethrough, a control rod slidably mounted insaid openings, -retaining members connected to the opposite ends of saidrod, means rigidly connected to the cen-' ."4'. A force multiplying unitcomprising a sup.-'

porting frame, a workelement mounted there: in and'equipped with aseries of ratchet teeth, a lever fulcrumed in-saidframe, a driving pawlmounted on said lever to engage the teeth of said work element andm oveit when the lever is actuated, a holding pawl mounted in said frame toengage said teeth and prevent backward movement of said work element, ablock pivotally mounted on one side of each of said pawls and providedwith an opening therethrough, a controlrod slidably mounted in saidopenings, retaining members connected to the opposite ends of said rod,means rigidly connected to the central portion of the rod, a coilspringencircling said rod between said means and the block on the drivingpawl, a second coil spring encircling the rod between the block on theholding pawl and the adjacent retaining member, means pivotallyconnected to said first-mentioned means and said frame, manuallyoperable means for shifting the position of said last-mentioned meanswhereby to shift the positions of said control rod and pawls to permitthe direction of movement ofsaid work element to be reversed, meansconnected to said manually operable means for. operating it from aremote position, resilient means for automatically returning said lever'to its original position'after each work movement, and means connectedto said lever for also operating it from said remote position.

THQMAS H. EDELBLUTE.

